Granite Countertops - DIY or Pay for Install???

My wife and I are buying a new home and are debating whether to pay the builder to install granite countertops in our kitchen or go with a standard formica countertop and go back later and do it ourselves. We're by no means experienced DIY'ers... Anyone have any advice on how difficult this would be and how much we'd be saving money-wise by doing ourselves. Builder is lookin' the charge us around $6K for the install for a pretty large kitchen and island.

Pay for the install. Granite comes in slabs that must be precisely cut, edged, installed grouted and polished. This requires very expensive and specialized tools. They are very heavy and awkward to move around. Granite counters are also really expensive, and a mistake will cost you thousands in material losses. This is a job I would leave to a pro.